PlzNavigate: properly set the initiator of the navigation

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 9dfaccb56b14242e7120ab845a0c505c0ac7e783..75c2df20101dbca0c2a184f4c505208807905686 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -6105,6 +6105,10 @@ void RenderFrameImpl::BeginNavigation(const NavigationPolicyInfo& info) {
          GetRequestContextFrameTypeForWebURLRequest(info.urlRequest) ==
              REQUEST_CONTEXT_FRAME_TYPE_NESTED);
 
+  base::Optional<url::Origin> initiator =
+      info.urlRequest.requestorOrigin().isNull()
+          ? base::Optional<url::Origin>()
+          : base::Optional<url::Origin>(info.urlRequest.requestorOrigin());
   Send(new FrameHostMsg_BeginNavigation(
       routing_id_, MakeCommonNavigationParams(info),
       BeginNavigationParams(
@@ -6113,7 +6117,7 @@ void RenderFrameImpl::BeginNavigation(const NavigationPolicyInfo& info) {
           info.urlRequest.hasUserGesture(),
           info.urlRequest.skipServiceWorker() !=
               blink::WebURLRequest::SkipServiceWorker::None,
-          GetRequestContextTypeForWebURLRequest(info.urlRequest))));
+          GetRequestContextTypeForWebURLRequest(info.urlRequest), initiator)));
 }
 
 void RenderFrameImpl::LoadDataURL(